Oil burner



C. H. THORNBLADE Aug 10 OIL BURNER Filed Nov. 19, 1924 2 Sheets-Sheet 1v INVENTOR Carl H o Thamblade Auk. 10 1926. 1,595,367

. Q C. 'H. THORNBLAD;

OIL BURNER Filed Nov. 19, 1924 2 Sheets-Sheet 2 4 z I 56 t I & I V 3INVENTOR- Carl Hugo Tharnblade Patented Aug. 10, 19.26.

UETED STATES CARL H. THORNBLADE, OF SEATTLE, 'WASHINGTON.

OIL BURNER] Application filed November 19, 1924. Serial No. 750,879.

My invention relates to oil burners of that type in which is employed agenerator heated by the burner ets, and in which the oil is heated togasification before being discharged.

The object of my invention is to generally improve the character and theoperation of such a burner and specifically to produce a design which isa composite burner employing a plurality of independently operableburner devices which may be operated either altogether or separately, asdesired, eachbeing designed for its own particular use.

The" special features of my invention which are new maybe determinedfrom a study of the drawings and the following specification.

Theaccompanying drawings illustrate my invention as embodied in the typeof construction which I now prefer. It will, however, be evident thatthis design may be modified in many details without really departingfrom the spirit of my invention.

Figure 1 is a top or plan view of my burner, having certain portionsthereof broken away and in section to better illustrate details of itsconstruction.

Figure 2-is a section taken upon a plane represented by the broken line22 of Figure 1.

Figure 3 is a section taken substantially upon the plane indicated bythe broken line 38 of Figure 1.

The composite burner here illustrated shows two separate burner units,these being of essentially like construction, the principles of theirconstruction and operation being alike. Each of these burners employs amixing chamber having burner jets mounted thereon, a generator whichlies alongside of the mixing chamber and is heated by jets therefrom,and a communicating conduit or passage which conveys the gas asdischarged from the generator to and into the mixing chamber. In theburner as illustrated, 1 rep resents the principal burners as a whole,and 10 the secondary or auxiliary burner. The mixing chamber 11 of themain burner is shown asbeing of substantiall square cross section,although the cross sectional shape of this burner may be made anythingwhich best suits the needs ofthe burner. The type of burner employed isthat which has a series of circular holes in its walls, in which holesare placed disksl2 which are of a re fractorymaterial and provided withacousiderable number of perforations 13. 7

These perforations produce the discharge of a largenumber of jets ofmixed airand vaporized oil and may be. placed at thetop of the burner orthe sides, as desired. A series of such'burner jets 13 are shown asplaced at oneside of the mixing chamber and these discharge directlyupon the generator tube2.

' The generator tube 2 is supported in guides or eyes as 20, formed atthe side of the casting which contains the mixing chamber and has at itsdischarge end a sleeve-21 in which is formed a small jet orifice. Thisdischarges into a fiue or channel l4: formed in this end of the maincasting in which the mixing chamber is formed. making a substantiallyhalf-circular bend and discharges. into the end of the'mixing chamber.In one side wall of thisfiue is a hole 15, located clo'sealongside ofthe discharge end of the generator.

Th jet discharged from the generator draws air through the opening 15 tomix therewith and form the combustible gas. To prevent ignition of thecombustible gas at the point where is, discharged from the generator, Iprefer to employ a flange 16 which constitutes an apron interposedbetween the air inlet opening 15 and the burner jets. Such apronwilllargely tend to pre-' vent the flashing of the flame from the burnerjets around to the air inlet opening 15.

The flange 16 may be carried out to such an.

extent to engage the side walls of the fire pot in which the burner isplaced. It also serves the purpose of holding thebody of the burner awayfrom the side walls a suiticient amount to prevent undue restriction ofthe space leading to the air inlet opening 15. That is, by the use ofsuch flange it is impossible to place the burner near enough to the sidewall but that ample area for the-supply of air is available.

The particular arrangementof the burner jets relied upon for supplyingthe heat is largely immaterial. the arrangement of the burner shown Ihave employed a circular table 17 at each end of the burner, this beingprovided'with a group of burner jets l3.

1 Beneath the generator 2, which isv in the form of a tube lyingalongside the burner, is a priming trough 22, into which may be Thiscurves,

placed gasoline, alcohol or any other easily thissort asjplacedinanordinary cool: stove ignited fluid the burning of which will heat thegenerator tube sufficiently to gasify the kerosene or other lessvolatile oil which may be used as the fuel; In prefer to,have the mixingchamber 11 given a slight slope towards the front end of the burner andto connect a pipe as 3 with this end of the burner, to serve as a drainpipe to convey therefrom. any oil which may be passed thereinto- .f'romthe burner, dueto incomplete gasification ort-o condensation in themixing chamber; I" also prefer to have the-priming trough 22'locatedsufiicientlybelow' the level of the bottom of" the mixing chamber thatany oil which may be found in this mixing chamberwill. flow by gravityinto the priming trough where it" will be ignited.

In order to control this discharge pipe a stopcock or valve 30 may beplaced therein.

This; stop: cock" be; left permanently open where it'is so connectedwith the prim:- ing' trough or' may be normally kept,closed, as desired,Ifl'eft open any oilwvhich is left in the mixing chamber will at onceflow to the priming; trough and by, action of the side jets 131. will beburnt, thus adding to the heating-of thegenerator; If, therefore, the;generator becomes cooled or is not, suflicientlyheatedto, thoroughlygasify the oil passing therethrough, oil will accumulate in the mixingchamber and will be discharged into the priming trough and by itsburningtherein will furnish ad,- ditional heat to the priming tube, andthis will tend, to correct the, discharge ofoil into the mixing: chamberso that such irregular-- ity and inperfection of operation tends tocorrect itself.

The tube: 2' which: forms the generator is mounted in ahole; providedin: an arm, or lug 20, extending from th main burner casting, in such.manner that it may be adjusted lengthwise of itself. A screw 23 orotherdevice may be employed for holding it in adjusted position. I have foundby experiment that the position of'the dis charge from the generatortube=relative to the air inlet opening 15 hasan effect upon the 1 actionof theburner. By adj listing-the generator tube so that the dischargeend thereof is extended'fartherinto the" passage 14', aricher'mixtureisobtained asthe suc= tion: effect produced upon the air is less than whenthe discharge end of the gen erator is moved fartherback. In. thisway acertain measure; of control may be: had over therichness of the mixturebeingemployed.

The secondary burner 10* is of essentially. the same construct-ionas themain burner 1. The generator tube 2, however,,is placed over the mixingchamber and the main heat.- ingsurface; is placed onone side, as isclearly shown im Figure 2. In" a burner-of or range, the secondaryburner 10 is placed at the rear Side of the fire pot, where it willdirectly heat the wall which separates the fire-pot from the oven.

The generator tube 2 of the secondary burner is also located wherespecial burner jets 18 of which two only are shown, will impinge uponone end of the generator tube. These two burner jets are the meansemployed for priming or preliminarily heating the generator of thesecondary burner. As a matter of convenience these two burner jets,

are permitted to burn whenever the main burner is being used. At timesit isnot desired to use the secondary burner. In this case the action ofthe burn r jets 135 would cause the end of the generator tobe overheatedand possibly burnt out... To, prevent. such action I provioe a shell,which consists of a piece of sheet metal at, bent into such shape thatone end thereof Willembrace and permit it to slide upon the generator2', while another portion thereof extends downward as a wing which maybe interposed between the burner jets l3 and the generator tube. Whilesuch a shell may become burnt out, itisvof cheap character and may beeasily replaced.

The discharge end 21. of the generator discharges its-jet into a curvedtubular, passage, which curves downward and discharges into themixingchamber 11 of. the secondary burner. Withthisl prefer to form" anair inlet opening, as 50, in the bottomwall of such chamber immediatelyunder the dischargejet. Also a second openh1g5, as 51, isprovided at oneside thereof. 1' also provide a flange 52 extending laterally so as toprotect these openings, both to prevent their being closed by placingthe burner too close to the wall of the re box, and also to prevent theflashing of t'he lame around the cornersso as to ignite the dis chargedjet before itenters the mixing chamber. As'further precautionto preventsuch action, a plate 58 may be secured to the outeredge of this flangeand extend downward so as:to form a thorough protection;

vVith the above type of burner, use of the mainburner 1' will sufiicefor ordinary cooking or heating purposes. If, however. the oven is tobeused and thehc'at. provided" by the main burner, is insufficient, thesecondary burner may be brought into use. After the secondary. burnerhas been ig nited, the main burner may be turned oif if a low heat inthe oven is desired.

Each of' these burners isprovided with its own'separate oil supply pipe,as 31 and 32. The control of the valves for the two generators ispreferably by the use of a key wrench which may be placed upon thesquared ends 345 of the valve stems. Sepa- Vtioned at the side thereofwhich is away from the auxiliary burner, a generator tube for theauxiliary burner positioned at the opposite side of the main burner andabove the auxiliary mixing chamber, the mixing chamber for the auxiliaryburner having burner jets in its side face which is away from the mainburner and the mixing chamber of the main burner having generatorheating discharge jets at opposite sides positioned to heat thegenerator tubes for both burners.

2. An oil burner having a main and an auxiliary burner set, eachprovided with a mixing chamber having burner orifices in a side face,the mixing chamber of the main burner being located close above and atone side of the mixing chamber of the auxiliary burner, a gen eratoitube for the main burner located at that side of the main burner whichis away from the auxiliary burner, a priming trough below said generatortube, a generator tube for the auxiliary burner located above its mixingchamber and alongside the mixing chamber of the main burner, the mixingchambers of each burner having gas discharge openings positioned to heatits respective generator, and the mixing chamber of the main burnerhaving gas discharge openings positioned to heat the generator of theauxiliary burner.

3. An oil burner having a main and an auxiliary burner set, eachprovided with a mixing chamber having burner orifices in a side face,the mixing chamber of the main burner being located close above and atone side of the mixing chamber of the auxiliary burner,-a generator tubefor the main burner located at that side of the main burner which isaway from the auxiliary burner, a priming trough below said generatortube, a generator tube for the auxiliary burner located above its mixingchamber and alongside the mixing chamber of the main burner, curvedconduit members connecting the ends of each generator tube with the likeend of its mixing chamber and having an air inlet opening at itsreceiving end, the mixing chambers of each burner having gas dischargeopenings positioned to heat its respective generator, and the mixingchamber of the main burner having gas discharge openings positioned toheat the generator of the auxiliary burner.

4. An oil burner having a main and an auxiliary burner set each providedwith a mixing chamber disposed alongside each other with the mixingchamber of the auxiliary burner immediately below and alongside of thelike chamber of the main burner, the mixing chamber of the auxiliaryburner having burner discharge openings at the side face which is awayfrom the main burner and generator heating openings in its upper face, agenerator tube extending lengthwise of the mixing chamber of theauxiliary burner over the discharge orifices in its upper face, andalongside of the mixing eh amber of the main burner, said latter mixingchamber having burner discharge openings towards one end positioned toheat the generator tube of the auxiliary burner, a protective shieldmovably lengthwise of said generator tube and adapted to protect it fromthe said jets from the main burner, and a generator tube alongside ofthe mixing chamber of the main burner, said mixing chamber having burnerjets in its side face for heating its generator tube.

Signed at Seattle, King County, Washington, this 1st day of November,1924.

CARL H. THORNBLADE.

